Unlock instant, AI-driven research and patent intelligence for your innovation.

Catalyst for preparing cyclohexene from benzene by selective hydrogenation and preparation method thereof

A catalyst and selective technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the cumbersome preparation of catalysts, expensive catalysts, catalyst loss, etc. problems, to achieve the effect of avoiding deep hydrogenation and other side reactions, good reaction stability, and reducing overall costs

Inactive Publication Date: 2014-12-10
TONGJI UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cumbersome preparation of unsupported catalysts and the low utilization rate of precious metal Ru, the catalyst is expensive and sensitive to sulfide, which seriously affects the life of the catalyst.
At the same time, as an unsupported nano-particle catalyst, there are problems of separation of reaction products and catalysts and serious catalyst loss, so the research on supported catalysts for this topic has become a new hot spot.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst for preparing cyclohexene from benzene by selective hydrogenation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Commercially available ZrO 2 After roasting at 300°C for 2 hours, it is ready for use. A certain amount of RuCl 3 ·xH 2 O was dissolved in distilled water (the weight of the metal accounted for 8% of the mass of the dispersed carrier), after an equal volume of vacuum impregnation, it was dried in flowing air at 85 °C for 24 h, and reduced in a hydrogen flow of 5 ml / min at 250 °C for 3 h. Catalyst A is obtained.

Embodiment 2

[0024] ZrOCl 2 ·8H 2 O and NH 3 ·H 2 O is precipitated according to the molar ratio of 1:3, and after making a gel, press Zr(OH) 4 It was added in a ratio of 1:0.2 to hydrogen peroxide, aged and refluxed at 96°C, pH=11.5 for 50h, filtered and dried, and calcined at 520°C for 1h. A certain amount of RuCl 3 ·xH 2 O was dissolved in distilled water (the weight of the metal accounted for 8% of the mass of the dispersed carrier), after an equal volume of vacuum impregnation, it was dried in flowing air at 85 °C for 24 h, and reduced in a hydrogen flow of 5 ml / min at 250 °C for 3 h. Catalyst B is obtained.

Embodiment 3

[0026] ZrOCl 2 ·8H 2 O and NH 3 ·H 2 O is precipitated according to 1:3, and after making a gel, press Zr(OH) 4 It was added in a ratio of 1:0.2 to hydrogen peroxide, aged and refluxed at 96°C, pH=11.5 for 50h, filtered and dried, and calcined at 520°C for 1h. A certain amount of RuCl 3 ·xH 2 O is dissolved in distilled water (the mass of the metal accounts for 8% of the mass of the dispersed carrier), and at the same time FeCl is added according to the molar ratio Ru:Fe=1:0.2 3 Afterwards, vacuum impregnation with equal volume, dried in flowing air at 85°C for 24h, and reduced at 250°C for 3h in 5ml / min hydrogen flow. Catalyst C is obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a catalyst for preparing cyclohexene from benzene by selective hydrogenation and a preparation method thereof. The invention mainly solves the problems of low benzene conversion rate, poor cyclohexene selectivity and quick catalyst deactivation in the technique for synthesizing cyclohexene from benzene by selective hydrogenation. By using one substance or a mixture of two substances as a dispersion supporter, noble metal as an active component and transition metal oxide as a assistant, the transition metal oxide treated by the special preparation technique well solves the problems. The operating conditions of the catalyst in the cyclohexene synthesis reaction from benzene by selective hydrogenation are as follows: the temperature is 100-300 DEG C; the hydrogen pressure is 2.0-6.0 MPa; the benzene / distilled water medium ratio is 0.1-3.0 (wt / wt); and the sulfate additive / catalyst ratio is 5.0-15.0. The selective hydrogenation catalytic reaction from benzene has favorable cyclohexene yield.

Description

technical field [0001] The invention relates to a catalyst for selective hydrogenation of benzene to generate cyclohexene and a preparation method thereof, which can be applied to the industrial production of cyclohexene by selective hydrogenation of benzene, and has high activity and high selectivity of cyclohexene. It can effectively avoid the deep hydrogenation of benzene and other side reactions, and the reaction stability is good. Background technique [0002] Cyclohexene is an important organic synthesis intermediate with active double bonds. As an organic chemical raw material, it can be widely used in the production of medicines, pesticides, agricultural chemicals, feed additives, polyesters and other fine chemicals. In particular, cyclohexanone and adipic acid, the deep-processing products of cyclohexene, are widely used intermediates in the synthesis of polyamide fibers. Since the 1980s, foreign countries proposed the selective hydrogenation of benzene to produce ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J23/89B01J23/652C07C5/11C07C13/20
CPCY02P20/52
Inventor 朱志荣张佳雷秦孟姣
Owner TONGJI UNIV